Reordering website related files in packages

[Amit-Oha]

No milestone is set as it is not required for the prototype, so deadline is not yet decided In order to implement the website faster (to reach prototype on time), some design flaws were introduced:

• StackSearch should be in entities
• StackSearchRepository should be in repositories
• SearchController should be in controllers

Because of Spring Boot convention-over-configuration, this would require some changes to the code and is not as trivial as it may sound.

[yossigil]

Think of policy for managing the backlog